Abstract
Fitts’s Law for the timing of targeted movements states that, when target width is held constant, movement time (MT) will increase as the travelled distance increases. Even imagined movements, mentally simulated actions without actual actions, obey Fitts’s Law. Recently, a violation of Fitts’s Law has been reported; when targets occur in a structured array, MT to the farthest target is shorter than that predicted by Fitts’s Law. We conducted two experiments to determine if the violation also occurs for imagined movements. Results showed a close correspondence between real and imaginary MTs across target locations, including the Fitts’s violation for the farthest target. We conclude that the violation of Fitts’s Law occurs in motor imagery and that the locus of the violation is in the planning stage of action.
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References
Adam JJ, Mol R, Pratt J, Fischer MH (2006) Moving farther but faster. An exception to Fitts’s Law. Psychol Sci 17:794–798
Al-Aidroos N, Fischer MH, Adam JJ, Pratt J (2008) Structured perceptual array and the modulation of Fitts’s Law: examining saccadic eye movements. J Motor Behav 40(2):155–164
Augustyn JS, Rosenbaum DA (2005) Metacognitive control of action: preparation for aiming reflects knowledge of Fitts’s law. Psychon Bull Rev 12(5):911–916
Bradi AC, Adam JJ, Fischer MH, Pratt J (2009) Modulating Fitts’s Law: the effect of disappearing allocentric information. Exp Brain Res 194:571–576
Decety J, Jeannerod M (1996) Mentally simulated movements in virtual reality: does Fitts’s Law hold in motor imagery? Behav Brain Res 72:127–134
Fischer MH, Pratt J, Adam JJ (2007) On the timing of reference frames for action control. Exp Brain Res 183:127–132
Fitts PM (1954) The information capacity of the human motor system in controlling the amplitude of movement. J Exp Psychol 47:381–391
Grosjean M, Shiffrar M, Knoblich G (2007) Fitts’s Law holds for action perception. Psychol Sci 18(2):95–99
Guillot A, Collect C, Nguyen VA, Malouin F, Richards C, Doyon J (2009) Brain activity during visual versus kinesthetic imagery: an fMRI study. Hum Brain Mapp 30:2157–2172
Jeannerod M (2001) Neural Simulation of action: a unifying mechanism for motor cognition. NeuroImage 14:103–109
Maruff P, Velakoulis D (2000) The voluntary control of motor imagery. Imagined movements in individuals with feigned motor impairment and conversion disorder. Neuropsychologia 38:1251–1260
Palmer S, Rock I (1994) Rethinking perceptual organization: the role of uniform connectedness. Psychon Bull Rev 1:29–55
Papaxanthis C, Pozzo T, Skoura X, Schieppati M (2002) Does order and timing in performance of imagined and actual movements affect the motor imagery process? The duration of walking and writing task. Behav Brain Res 134:209–215
Plamondon R, Alimi AM (1997) Speed/accuracy trade-offs in target-directed movements. Behav Brain Sci 20:279–349
Pratt J, Adam JJ, Fischer MH (2007) Visual layout modulates Fitts’s Law: the importance of first and last positions. Psychon Bull Rev 14(2):350–355
Schwoebel J, Boronat CB, Coslett HB (2001) The man who executed “imagined” movements: evidence for dissociable components of the body schema. Brain Cogn 50:1–16
Sirigu A, Duhamel JR, Cohen L, Pillon B, Dubois B, Agid Y (1996) The mental representation of hand movements after parietal cortex damage. Science 273:1564–1568
Acknowledgments
This work was supported by a grant from the Natural Sciences and Engineering Council of Canada to JP. Correspondence regarding this study should be directed to Jay Pratt, Department of Psychology, University of Toronto, 100 St. George Street, Toronto, ON, Canada, M5S 3G3.
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Radulescu, P.V., Adam, J.J., Fischer, M.H. et al. Fitts’s Law violation and motor imagery: are imagined movements truthful or lawful?. Exp Brain Res 201, 607–611 (2010). https://doi.org/10.1007/s00221-009-2072-2
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DOI: https://doi.org/10.1007/s00221-009-2072-2